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  1. #1
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    Question N550JK w/hd caddy probs- ACPI.sys causing lots of system interrupts/DPC count[solved]

    Hi,
    Recently I upgraded my Asus N550JK with a 512GB SSD, MX100 from Crucial, and replaced my DVD drive with the old hard drive. I successfully wiped the 1tb hard drive I had in before and installed Windows 8.1 64-bit onto the SSD. Almost everything is working as intended.

    When I opened task manager, I notice an odd thing, my cpu usage was higher when my computer was doing nothing at all. (seen here: http://i.imgur.com/bav1ACJ.png )

    After doing some research I began using two tools to uncover the problem. The first of which, LatencyMon, told me that the ACPI.sys driver was causing issues. This is what I see:

    http://i.imgur.com/FBl0Bop.png
    http://i.imgur.com/Z7ftcrd.png

    I have also used the "Windows Performance Analyzer" developed my Microsoft, and found similar results:

    http://i.imgur.com/E2xsz0L.png

    I have updated my bios to version 208 and updated my chipset drivers to the latest version. I reinstalled the ATKAPCI package for the model N550JK and have had no luck.

    I've contacted support many times and they cannot figure out what is wrong. I am slightly frustrated because my laptop only lasts for an hour on battery life due to this issue.

    Research I've done indicates owners of computers with SSD's are more likely to have this issue, and it is surprisingly common in laptops.

    Other people have suggested on various forums to rollback the bios to an earlier version of Asus Bios, I believe it was 205, but I can't and won't download from a random source.

    Disabling various devices in the device manager does not seem to fix anything either. I believe there is a bug in the code.

  2. #2
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    Hi,

    Sorry, didn't study your post too carefully, so you may or may not want to take my comments seriously, but if you are still under warranty for your notebook (and battery?), thinking you may want to consider looking into this option later too if you can't find an easier solution.

    If you want to look into warranty service (or a possible bad battery?), you would probably need to or may want to try putting everything back to how it was originally if this isn't too much trouble just to confirm none of the changes were related to these issues.

    I'm ignoring the possibility of software-related causes right now though assuming that if all the N550JK notebooks had this same software issue, ASUS would know about it and more people would be complaining, so theorizing the problem may just be isolated to your unit.
    If it's a hardware-related issue, try to get warranty service if you're still covered and if it's a software issue, you may want to reinstall the original ASUS Windows image (and hard drive?) if necessary to check this.

    Good luck and hopefully others can provide better suggestions, but just wanted to run these ideas by you.

  3. #3
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    Thank you for your reply. Is there any way I could get the original Asus Windows image and reinstall it myself? My notebook is still under warranty and I may have to send it in for another unrelated issue but I'd really rather not have to send it in since it is minor.

  4. #4
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    Unfortunately, if your unit came with Win8/8.1 and you didn't back up the recovery partition first, there usually isn't another way to get it back without sending it in unless you happen to know somebody with the same model who can provide a back up of their recovery partition image (check this link about the ASUS Backtracker software: http://rog.asus.com/forum/showthread...very-Partition).

    Did you erase the original hard drive though (with ASUS image installed?), or can you put it back to check if there is any difference?

    Although we would like to compare with the original ASUS Windows image, it's possible this may not make a difference either though.
    Last edited by cl-Albert; 12-12-2014 at 05:05 PM.

  5. #5
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    I've erased the original drive unfortunately. I may just have to send it in over break or drive down to a service center. Do you happen to know about how long the turn around time for sending my notebook in for warranty might be?

  6. #6
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    Update and solution:

    I've successfully fixed the problem.

    On my HDD caddy, http://www.amazon.com/gp/product/B004Y8SGXW , there is a tiny switch on the side that when I switched it to the other position I no longer have any problem with ACPI.sys creating system interrupts.

    Another forum I was reading suggested that their HDD caddy had messy soldering so I took apart my caddy and only then did I realize that there was a switch. I tried to do some research on my caddy but couldn't find anything except in the reviews on Amazon, where other people suggested flicking the switch if they were having any sorts of problems. Flicking the switch solved all of my problems.

  7. #7
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    Thanks for the update Famzilla and glad you could solve it!

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